Nuclear power plant airtight space safety protection control system and method

Abstract

The invention relates to a nuclear power plant airtight space safety protection control system and method. The system comprises a general control unit, a plurality of input and output units, a relay unit and a plurality of local response devices. Each airtight door is provided with a local response device; the plurality of input and output units are used for acquiring door magnetic detection signals generated by the plurality of sets of local response devices, returning the door magnetic detection signals to the master control unit and sending switch control signals output by the master control unit to the relay unit; the relay unit executes corresponding on / off control according to the on-off control signal; and each local response device monitors the state of the air-tight door, outputs a door magnetic detection signal when the air-tight door is opened, and executes local alarm based on the on / off control of the relay unit. Automatic protection, automatic management and early warning prompt of a system device are added, double opening or multi-opening of the airtight door due to reasons such as mistakes of passing personnel is effectively avoided, and consequences caused by serious damage to the integrity of the airtight space are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of ventilation systems for nuclear power plants, and more particularly to a control system and method for the safety protection of airtight spaces in nuclear power plants. Background Art

[0002] The nuclear auxiliary building ventilation system (DVN) is the largest ventilation system in the nuclear island ventilation. It is used to provide ventilation to different rooms and plays a relatively important role. It is mainly used to: keep the internal temperature of the high-temperature area of ​​the nuclear auxiliary building and the electrical building within the range specified for normal equipment operation, personnel health and safety during the normal operation of the nuclear power plant; exhaust smoke when a fire occurs in the electrical room of the nuclear auxiliary building; limit the aerosol radioactivity level in the room according to the radiation protection classification to facilitate personnel entry, etc.

[0003] The wind chamber and duct room of the nuclear auxiliary plant ventilation system and the containment corridor room ventilation system (DVW) are generally set up next to the filter modules of the air inlet and exhaust sections of the ventilation system. Maintenance personnel need to enter the wind chamber and duct room to work during daily inspections and repairs. When entering the wind chamber and duct room, personnel need to pass through some independent rooms without vents. These independent rooms serve as transition areas between ordinary plants and ventilation system wind chambers and duct rooms. When personnel enter and exit the ventilation system room through these transition areas, they need to comply with the requirement to close all airtight doors before opening the target airtight door. The current measures mainly rely on management requirements and personnel behavior norms to implement. If the operator opens two or more airtight doors in the transition area at the junction of the ventilation system by mistake, it may cause the air volume and pressure of the plant to be unstable, thereby triggering an alarm, affecting the positive and negative pressure configuration of the plant, and in severe cases, there may be a risk of radioactive gas leakage. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a nuclear power plant airtight space safety protection control system and method in view of the problems existing in the prior art.

[0005] The technical solution adopted by the present invention to solve the technical problem is: construct a nuclear power plant airtight space safety protection control system, including: a master control unit, a plurality of input and output units, a relay unit connected to the plurality of input and output units, and a plurality of local response devices corresponding to the plurality of input and output units; each airtight door is equipped with a set of local response devices;

[0006] The multiple input and output units are used to collect the door magnetic detection signals generated by the multiple sets of local response devices and return them to the main control unit, and send the switch control signal output by the main control unit to the relay unit;

[0007] The relay unit is used to perform corresponding on / off control according to the switch control signal;

[0008] Each set of the local response device is used to monitor the status of the airtight door connected thereto, output the door magnetic detection signal when the airtight door is opened, and execute a local alarm based on the on / off control of the relay unit.

[0009] In the nuclear power plant airtight space safety protection control system of the present invention, each of the input and output units comprises: an input module and an output module;

[0010] The input module is connected to the master control unit and the local response device corresponding to it, and is used to collect the door magnetic detection signal generated by the local response device corresponding to it and return it to the master control unit;

[0011] The output module is connected to the master control unit and the relay unit respectively, and is used to send the switch control signal output by the master control unit to the relay unit.

[0012] In the nuclear power plant airtight space safety protection control system described in the present invention, the input module is a DI module, and the output module is a DO module.

[0013] In the nuclear power plant airtight space safety protection control system described in the present invention, the master control unit includes: a PLC controller or a single-chip microcomputer.

[0014] In the nuclear power plant airtight space safety protection control system described in the present invention, the local response device includes: a door magnetic switch, an audible and visual alarm, and an electromagnetic lock;

[0015] The door magnetic switch is connected to the input module, and is used to monitor the state of the airtight door and output the door magnetic detection signal when the airtight door is opened;

[0016] The sound and light alarm is connected to the relay unit and is used to perform a local sound and light alarm according to the on / off control of the relay unit;

[0017] The electromagnetic lock is connected to the relay unit to perform an excitation operation according to on / off control of the relay unit.

[0018] In the nuclear power plant airtight space safety protection control system of the present invention, the local response device further comprises: a first emergency door opening button and a second emergency door opening button which are arranged on the airtight door and are respectively located inside and outside the airtight door;

[0019] The first emergency door opening button and the second emergency door opening button are used to control the opening of the airtight door according to an emergency door opening trigger signal.

[0020] In the nuclear power plant airtight space safety protection control system described in the present invention, the electromagnetic lock is connected in series with the first emergency door opening button and the second emergency door opening button.

[0021] In the nuclear power plant airtight space safety protection control system described in the present invention, the sound and light alarm is a flexible sound and light alarm.

[0022] In the nuclear power plant airtight space safety protection control system described in the present invention, the relay unit includes: a plurality of relays; the plurality of relays are arranged corresponding to the plurality of local response devices.

[0023] The present invention also provides a method for safety protection control of airtight space in a nuclear power plant, comprising the following steps:

[0024] The local response device monitors the state of the airtight door and outputs a door magnetic detection signal when the airtight door is opened;

[0025] The input and output module collects the door magnetic detection signal and returns it to the main control unit;

[0026] The master control unit outputs a corresponding switch control signal to the relay unit according to the door magnetic detection signal;

[0027] The relay unit performs corresponding on / off control according to the switch control signal;

[0028] The local response device performs a local alarm and closes the airtight door according to the on / off control of the relay unit.

[0029] The implementation of the nuclear power plant airtight space safety protection control system and method of the present invention has the following beneficial effects: including: a master control unit, multiple input and output units, a relay unit and multiple sets of local response devices; each airtight door is equipped with a set of local response devices; multiple input and output units collect the door magnetic detection signals generated by multiple sets of local response devices and return them to the master control unit, and send the switch control signal output by the master control unit to the relay unit; the relay unit performs corresponding on / off control according to the switch control signal; each local response device monitors the state of the airtight door, outputs the door magnetic detection signal when the airtight door is opened, and performs local alarm based on the on / off control of the relay unit. The present invention increases the automatic protection, automatic management and early warning prompts of the system device, effectively avoiding the double or multiple opening of the airtight door due to the mistakes of the passers-by, and avoiding the consequences caused by the serious damage to the integrity of the airtight space. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0031] Figure 1 It is a principle block diagram of the nuclear power plant airtight space safety protection control system provided by the present invention;

[0032] Figure 2 It is an application schematic diagram of the nuclear power plant airtight space safety protection control system provided by the present invention;

[0033] Figure 3 It is a partial circuit schematic diagram of a specific embodiment provided by the present invention;

[0034] Figure 4 It is a flow chart of the nuclear power plant airtight space safety protection control method provided by the present invention. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] refer to Figure 1 , Figure 1 The principle block diagram of a preferred embodiment of the airtight space safety protection control system of a nuclear power plant provided by the present invention. The airtight space referred to in the present invention is the transition area at the junction of the ventilation system of the nuclear power plant where the operators are located, that is, the transition area between the ordinary plant and the wind room and duct room of the ventilation system.

[0037] Specifically, Figure 1As shown, the nuclear power plant airtight space safety protection control system includes: a master control unit 10, multiple input and output units 20, relay units 30 connected to the multiple input and output units 20, and multiple sets of local response devices 40 corresponding to the multiple input and output units 20; each airtight door is equipped with a set of local response devices. It should be noted that generally there are multiple airtight spaces in a nuclear power plant. Based on this, the present invention only needs to set up a set of systems to achieve real-time monitoring and control of the status of the airtight doors of multiple airtight spaces. That is, in the embodiment of the present invention, the nuclear power plant airtight space safety protection control system only needs to set up a master control unit 10, multiple input and output units 20, multiple relay units 30 and multiple sets of local response devices 40 to achieve real-time monitoring and control of the status of the airtight doors of multiple airtight spaces. Among them, the number of multiple input and output units 20 is appropriately increased or decreased according to the number of airtight doors; similarly, the number of relay units 30 is also appropriately increased or decreased according to the number of airtight doors; similarly, the number of local response devices is also appropriately increased or decreased according to the number of airtight doors. For example, an airtight space with six airtight doors is used as an example for explanation. Correspondingly, six input and output units can be provided, six relay units 30 are also provided, and six local response devices are also installed. When there is more than one airtight space in a nuclear power plant, the input and output units, relay units 30 and local response devices are adjusted according to the number of airtight doors in the airtight space, and only one master control unit 10 is required.

[0038] In the embodiment of the present invention, the plurality of input and output units 20 are used to collect the door magnetic detection signals generated by the plurality of local response devices 40 and return them to the main control unit 10, and send the switch control signal output by the main control unit 10 to the relay unit 30. The relay unit 30 is used to perform the corresponding on / off control according to the switch control signal. Each set of local response devices is used to monitor the status of the airtight door connected thereto, output the door magnetic detection signal when the airtight door is opened, and perform the local alarm based on the on / off control of the relay unit 30.

[0039] Optionally, in an embodiment of the present invention, each input-output unit includes: an input module and an output module.

[0040] Among them, the input module is respectively connected to the main control unit 10 and the local response device corresponding to it, and is used to collect the door magnetic detection signal generated by the local response device corresponding to it and return it to the main control unit 10; the output module is respectively connected to the main control unit 10 and the relay unit 30, and is used to send the switch control signal output by the main control unit 10 to the relay unit 30.

[0041] Optionally, in an embodiment of the present invention, the input module is a DI module and the output module is a DO module.

[0042] Furthermore, in the embodiment of the present invention, the nuclear power plant airtight space safety protection control system further includes a power supply module 50, which is used to provide power to the modules or units in the nuclear power plant airtight space safety protection control system. The power supply module 50 can convert 220V AC into 24V and 12V DC, thereby providing corresponding power to the modules in the system.

[0043] Optionally, in the embodiment of the present invention, the master control unit 10 includes: a PLC controller or a single chip microcomputer, that is, any controller or single chip microcomputer that can realize the control program of the airtight door interlocking function and the local alarm control will suffice.

[0044] Optionally, in an embodiment of the present invention, each local response device includes: a door magnetic switch, an audible and visual alarm, and an electromagnetic lock.

[0045] Among them, the door magnetic switch is connected to the input module, which is used to monitor the state of the airtight door and output the door magnetic detection signal when the airtight door is opened. The sound and light alarm is connected to the relay unit 30, which is used to execute the local sound and light alarm according to the on / off control of the relay unit 30. The electromagnetic lock is connected to the relay unit 30, which is used to perform the excitation operation according to the on / off control of the relay unit 30. Optionally, in an embodiment of the present invention, the sound and light alarm is a flexible sound and light alarm. Specifically, since the buzzer used in the conventional sound and light alarm is relatively harsh and it is easy to be frightened by the buzzer and misjudge the situation on the scene, the present invention adopts a flexible sound and light alarm to play pre-recorded voice content through the flexible sound and light alarm to prompt passers-by to open the airtight door in a standardized manner.

[0046] Furthermore, in an embodiment of the present invention, each set of local response devices further includes: a first emergency door opening button and a second emergency door opening button which are arranged on the airtight door and are respectively located inside and outside the airtight door. The first emergency door opening button and the second emergency door opening button are used to control the opening of the airtight door according to the emergency door opening trigger signal. Among them, the first emergency door opening button is arranged in the airtight space (i.e., the inside of the airtight door), and the second emergency door opening button is arranged outside the airtight space (i.e., the outside of the airtight door).

[0047] In the embodiment of the present invention, the electromagnetic lock is connected in series with the first emergency door opening button and the second emergency door opening button.

[0048] Optionally, in an embodiment of the present invention, the relay unit 30 includes: a plurality of relays; and the plurality of relays are arranged corresponding to a plurality of sets of local response devices 40 .

[0049] like Figure 2 The following is a schematic diagram of an application example of the nuclear power plant airtight space safety protection control system provided by the present invention. Figure 2As shown, an airtight space with 6 doors is taken as an example. An electromagnetic lock, a door magnetic switch, and an audible and visual alarm are installed on each airtight door, and local equipment such as emergency door opening buttons (the first emergency door opening button and the second emergency door opening button) are added on both sides of the airtight door. A control box is installed outside the airtight space, and the master control unit 10 (i.e., a PLC controller or a single-chip microcomputer) in the box is connected to the electromagnetic lock, the door magnetic switch, the first emergency door opening button, the second emergency door opening button, the audible and visual alarm and other equipment in the room through cables. The airtight door interlocking function is realized by setting a PLC controller with a 6-door PLC program. Among them, the master control unit 10 is not directly connected to the electromagnetic lock, the door magnetic switch, the first emergency door opening button, the second emergency door opening button, the audible and visual alarm and other equipment. That is, as Figure 2 As shown, a DI module is also provided between the door magnetic switch and the main control unit 10, and the DI module monitors the door magnetic detection signal of the door magnetic switch and transmits it to the main control unit 10, and a relay is also provided between the first emergency door opening button, the second emergency door opening button and the electromagnetic lock and the main control unit, and the connection between the control circuit and the power circuit is realized through the relay. Among them, the relay plays an isolation role, and can also realize the transmission of the control circuit signal and the transmission of the power supply signal. That is, the main control unit 10 outputs a control signal through the DO module, and the control signal controls the relay to perform an on / off operation (such as the relay is closed). At this time, the power supply module is connected to the sound and light alarm, the first emergency door opening button, the second emergency door opening button and the electromagnetic lock through the action of the relay, so that the power supply of the sound and light alarm, the first emergency door opening button, the second emergency door opening button and the electromagnetic lock is turned on. As shown Figure 2 As shown, the door magnetic switch, the sound and light alarm, the first emergency door opening button, the second emergency door opening button and the electromagnetic lock are connected to the circuit through the terminal block.

[0050] The control logic is as follows: when the door magnetic switch detects that any airtight door connected to the PLC controller is open, the PLC controller will connect the power supply of all electric locks of the airtight doors in the same transition partition, lock the door body, and trigger the sound and light alarm of the same transition partition. The sound and light alarm will issue a voice broadcast to remind passers-by: that is, a door body in the partition has been opened, and the opened door body must be closed before another door can be opened; at the same time, the system also has an emergency function of opening the door lock of the room in an emergency through the first emergency door opening button or the second emergency door opening button on any airtight door. The control principle is as follows: Figure 3 shown.

[0051] like Figure 3As shown, 001SM OPEN, 002SM OPEN, 003SM OPEN, 004SM OPEN, 005SM OPEN and 006SM OPEN are respectively the door magnetic detection signal of airtight door No. 1 (i.e., door No. 1 is opened), the door magnetic detection signal of airtight door No. 2 (i.e., door No. 2 is opened), the door magnetic detection signal of airtight door No. 3 (i.e., door No. 3 is opened), the door magnetic detection signal of airtight door No. 4 (i.e., door No. 4 is opened), the door magnetic detection signal of airtight door No. 5 (i.e., door No. 5 is opened) and the door magnetic detection signal of airtight door No. 6 (i.e., door No. 6 is opened). 001TO is the first emergency door-opening button on No. 1 airtight door, 101TO is the second emergency door-opening button on No. 1 airtight door, 002TO is the first emergency door-opening button on No. 2 airtight door, 102TO is the second emergency door-opening button on No. 2 airtight door, 003TO is the first emergency door-opening button on No. 3 airtight door, 103TO is the second emergency door-opening button on No. 3 airtight door, 004TO is the first emergency door-opening button on No. 4 airtight door, 104TO is the second emergency door-opening button on No. 4 airtight door, 005TO is the first emergency door-opening button on No. 5 airtight door, 105TO is the second emergency door-opening button on No. 5 airtight door, 006TO is the first emergency door-opening button on No. 6 airtight door 106TO is the second emergency door-opening button on No. 6 airtight door; 001EA is the electromagnetic lock on No. 1 airtight door, 002EA is the electromagnetic lock on No. 2 airtight door, 003EA is the electromagnetic lock on No. 3 airtight door, 004EA is the electromagnetic lock on No. 4 airtight door, 005EA is the electromagnetic lock on No. 5 airtight door, 006EA is the electromagnetic lock on No. 6 airtight door; 001LA is the sound and light alarm on No. 1 airtight door, 002LA is the sound and light alarm on No. 2 airtight door, 003LA is the sound and light alarm on No. 3 airtight door, 004LA is the sound and light alarm on No. 4 airtight door, 005LA is the sound and light alarm on No. 5 airtight door, 006LA is the sound and light alarm on No. 6 airtight door.

[0052] like Figure 3As shown, when any one of the airtight doors No. 1, No. 2, No. 3, No. 4, No. 5 and No. 6 in the airtight space is opened, the door magnetic detection switch installed on the door detects that the airtight door is opened and outputs a door magnetic detection signal. At this time, the DI module corresponding to the airtight door detects the door magnetic detection signal of the airtight door and sends the door magnetic detection signal to the PLC controller. After receiving the door magnetic detection signal, the PLC controller controls the power supply of all electromagnetic locks in the airtight space (i.e., the same transition partition) where the airtight door is located to be turned on, so as to lock all other airtight doors in the airtight space to prevent one or more other airtight doors in the same airtight space from being opened again. At the same time, all sound and light alarms in the airtight space send out local alarms. For example, airtight door No. 1 is opened. At this time, the door magnetic detection switch of airtight door No. 1 detects that it is opened and outputs a door magnetic detection signal. The DI module connected to the door magnetic detection switch of airtight door No. 1 detects the door magnetic detection signal and sends it to the PLC controller. After receiving the door magnetic detection signal, the PLC controller outputs a control signal to the DO module, and controls the relay to close through the DO module, thereby turning on the power of all electromagnetic locks of airtight doors No. 1 to No. 6. At this time, 001EA to 006EA are all energized, and airtight door No. 2, airtight door No. 3, airtight door No. 4, airtight door No. 5, and airtight door No. 6 are all locked. At this time, since airtight door No. 1 has been opened, airtight door No. 1 cannot be locked, and then a local alarm is sounded through the sound and light alarm to remind personnel to close the opened airtight door in time.

[0053] refer to Figure 4 , Figure 4 The present invention provides a flow chart of a method for controlling the safety protection of an airtight space in a nuclear power plant, wherein the method for controlling the safety protection of an airtight space in a nuclear power plant can be applied to the airtight space safety protection control system of a nuclear power plant disclosed in an embodiment of the present invention.

[0054] Specifically, Figure 4 As shown, the nuclear power plant airtight space safety protection control method includes the following steps:

[0055] Step S401: the local response device monitors the status of the airtight door and outputs a door magnetic detection signal when the airtight door is opened.

[0056] Step S402 : the input-output module collects the door magnetic detection signal and returns it to the main control unit 10 .

[0057] Step S403: the master control unit 10 outputs a corresponding switch control signal to the relay unit 30 according to the door magnetic detection signal.

[0058] Step S404: the relay unit 30 performs corresponding on / off control according to the switch control signal.

[0059] Step S405 : the local response device performs a local alarm according to the on / off control of the relay unit 30 .

[0060] The present invention can simultaneously control multiple airtight doors in different partitions to prevent double or multiple openings; trigger an audible and visual alarm when the airtight space is opened to remind passers-by to open the airtight doors in a standardized manner; and provide an emergency door opening means.

[0061] In addition, the present invention effectively solves the problem of automatic management and protection of places with airtight space management requirements such as nuclear power auxiliary buildings, avoids double or multiple openings of airtight doors due to mistakes made by passers-by, avoids damage to the integrity of the airtight space, prevents unstable air volume and pressure in the building, affects the positive and negative pressure configuration of the building, and eliminates some serious consequences caused by partial failure of the ventilation system due to damage to the integrity of the airtight space.

[0062] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0063] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0064] The steps of the method or algorithm described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), a memory, a read-only memory (ROM), an electrically programmable ROM, an electrically erasable programmable ROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0065] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot limit the scope of protection of the present invention. All equivalent changes and modifications made to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A nuclear power plant airtight space safety protection control system, characterized in that: include: A master control unit, a plurality of input and output units, a relay unit connected to the plurality of input and output units, and a plurality of local response devices arranged corresponding to the plurality of input and output units; Each airtight door is equipped with a local response device; The multiple input and output units are used to collect the door magnetic detection signals generated by the multiple sets of local response devices and return them to the main control unit, and send the switch control signal output by the main control unit to the relay unit; The relay unit is used to perform corresponding on / off control according to the switch control signal; Each set of the local response device is used to monitor the status of the airtight door connected thereto, output the door magnetic detection signal when the airtight door is opened, and execute a local alarm based on the on / off control of the relay unit.

2. The nuclear power plant airtight space safety protection control system according to claim 1, characterized in that: Each of the input and output units includes: an input module and an output module; The input module is connected to the master control unit and the local response device corresponding to it, and is used to collect the door magnetic detection signal generated by the local response device corresponding to it and return it to the master control unit; The output module is connected to the master control unit and the relay unit respectively, and is used to send the switch control signal output by the master control unit to the relay unit.

3. The nuclear power plant airtight space safety protection control system according to claim 2, characterized in that: The input module is a DI module, and the output module is a DO module.

4. The nuclear power plant airtight space safety protection control system according to any one of claims 1 to 3, characterized in that: The master control unit includes: a PLC controller or a single chip microcomputer.

5. The nuclear power plant airtight space safety protection control system according to claim 2, characterized in that: The local response device includes: a door magnetic switch, an audible and visual alarm, and an electromagnetic lock; The door magnetic switch is connected to the input module, and is used to monitor the state of the airtight door and output the door magnetic detection signal when the airtight door is opened; The sound and light alarm is connected to the relay unit and is used to perform a local sound and light alarm according to the on / off control of the relay unit; The electromagnetic lock is connected to the relay unit to perform an excitation operation according to on / off control of the relay unit.

6. The nuclear power plant airtight space safety protection control system according to claim 5, characterized in that: The local response device further includes: a first emergency door opening button and a second emergency door opening button which are arranged on the airtight door and are respectively located inside and outside the airtight door; The first emergency door opening button and the second emergency door opening button are used to control the opening of the airtight door according to an emergency door opening trigger signal.

7. The nuclear power plant airtight space safety protection control system according to claim 6, characterized in that: The electromagnetic lock is connected in series with the first emergency door opening button and the second emergency door opening button.

8. The nuclear power plant airtight space safety protection control system according to claim 5, characterized in that: The sound and light alarm is a flexible sound and light alarm.

9. The nuclear power plant airtight space safety protection control system according to claim 1, characterized in that: The relay unit includes: a plurality of relays; the plurality of relays are arranged corresponding to the plurality of sets of local response devices.

10. A method for safety protection and control of airtight space in a nuclear power plant, characterized in that: The following steps are involved: The local response device monitors the state of the airtight door and outputs a door magnetic detection signal when the airtight door is opened; The input and output module collects the door magnetic detection signal and returns it to the main control unit; The master control unit outputs a corresponding switch control signal to the relay unit according to the door magnetic detection signal; The relay unit performs corresponding on / off control according to the switch control signal; The local response device performs a local alarm according to the on / off control of the relay unit.

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